Novel Trials to Control Harmful Algal Blooms in Seawater

Hyun?Jae Shin,Hoon Cho,Un?Sun Jin,Yun?Kyung Park,Si Wouk Kim 한국생물공학회 2010 한국생물공학회 학술대회 Vol.2010 No.10

신경회로망에서 뉴런간의 연결도를 이용한 4백 배치 문제 해결 알고리즘

현해진,김덕주,강부식,이기태,임재윤 濟州大學校 工科大學 産業技術硏究所 1993 産業技術硏究報告 Vol.4 No.-

In this paper we have proposed a method for solving a four-coloring problem using adjusted information transmission between adjacent neurons in neural networks. These algorithms are based on McCclloch-Pitts binary neuron model neural networks. If a map shares n regions, a 4×n neural array is used to color a map of n regions where each neuron as a processing element performs it. By programming these algorithm by a C-language in IBM PC 486 DX and adapting it to various examples, we have showed the ability of our system. If one neuron is selected among four neurons, the strength of order three neurons is wakened. So, by transmitting the information of selected neuron, adjacent neurons cannot share the same color.

불소농도가 인공우식 범랑질의 재석회화에 미치는 영향

윤현두,백병주,김재곤 大韓小兒齒科學會 1996 大韓小兒齒科學會誌 Vol.23 No.1

The purpose of this study was to evaluate the remineralized effect of fluoride on artificial carious enamel after topical fluoride application and to certificate the most appropriate fluoride concentration. Artificial demineralized bovine enamel blocks were randomly assigned to four groups, and placed in fluoride, 100, 5,000 and 12,000ppm acidulated phosphate fluoride solution. Sound enamel blocks without artificial carious lesion were used as control group. In this study, the morphological characteristics of treated enamel surface and effect of fluoride concentration on remineralization of artificial carious enamel has been investigated by using scanning electron microscopy, chemical analysis and electron probe microanalysis compared with the effect of various fluoride concentration. The Following results were obtained. 1. The enamel surface treated with 100ppm APF was observed more demineralized surface with lots of holes and loosely bounded a few globules. 5,000ppm APF treatment produced a deposits of numerous spherical globules 0.5∼1㎛ in diameter and distinctive rectangular and cuboidal shaped deposits were formed by 12,000ppm APF treament. 2. Amount of KOH-soluble fluoride on enamel surfaces was increated according to treated fluoride concentration level. In the Ⅳ and Ⅴ group were showed significantly higher than that in the Ⅲ group(p<0.05). 3. After treatment with 5,000 and 12,000ppm APF, a remarkable elevation of the fluoride profile was observed within 30㎛ of the outermost layer and was accompanied simultaneously by a high elevation of the calcium profile. However, specimens treated with 100ppm APF showed only a small elevation of fluoride within whole depth than that in the sound and demineralized enamel specimens. 4. In the Ⅳ and Ⅴ group, Ca/P weight percent ratio were showed higher than that in the Ⅰ, Ⅱ, Ⅲ group in 5 and 15㎛ depth, and fluoride content were showed statistically different than that in the Ⅰ, Ⅱ, Ⅲ group in all depth(p<0.05).

와동내에 조사된 열의 전도양상에 관한 연구

윤현두,허선,김재곤,이두철,백병주 大韓小兒齒科學會 1998 大韓小兒齒科學會誌 Vol.25 No.3

The purpose if this study was to evaluate temperature change occurred in enamel, dentin and pulp due to the heat from cavity prepration with laser. We made three models had different cavity depth : cavity depth of model Awas 3.52mm, model B was 2.32mm, model C was 1.16mm. We irradiated cavity base with thermal capacity of 30J,100J,300J/㎤s during few seconds and studied the change of temperature in tooth during 10 seconds, and estimated change of thermal capacity by different irradiated site and exposure time. AT 300j/㎤s irradiation for 2 seconds, the temperature of irradiated surface was elevated fast according to irradiated thermal energy during I second, In proportion to continuous exposure time, temperature elevated slowly The surface temperature was 1370℃. After discontinue of thermal irradiation, the heat of irradiated surface was diffused in dentin and pulp and the greatest temperature was made, The greatest temperature was disappeared within 10 seconds The greatest temperature of the inner part of model brought about very severe change by different depth. Temperature in pulp was raised by the greater irradiated energy density and exposure time.

건축물 고형시료 중 석면 분석을 위한 방해 물질 제거방법에 대한 연구

김윤재,임지현,장봉기 순천향대학교 기초과학연구소 2021 순천향자연과학연구 논문집 Vol.27 No.1.2

In this study the following pretreatment methods are proposed using solid samples of buildings : furnace ashing methods according to the existing waste process, acid treatment after furnace ashing, acid treatment using graphite block acid circulation, a new method of attempting. This study propose a method for pretreatment of solid samples in buildings containing asbestos with a comparison of the asbestos analysis obstruction removal rates according to the above mentioned methods. The materials used in this study are 48 slates of 3 types and 48 textures of 3 types, total 96 samples which are solid samples in buildings. Pretreatment and acid treatment methods were classified in four ways: Electric high temperature furnace ashing methods according to the existing waste process and acid treatment with HCl(1+3)(Group A), Electric high temperature furnace ashing methods and acid treatment with aqua regia(HCl 3 : HNO3 1)(Group B), acid treatment with aqua regia(Group C) using graphite block acid circulation, a new method of attempting and acid treatment with inverse aqua regia(Group D). The removal rate of furnace ashing from slate samples in A and B treatment groups was 13.91%, and the removal rate of furnace ashing from texture samples in A and B treatment groups was 9.21%, so the removal rate of furnace ashing from slate samples was significantly higher than texture samples(p<0.001). The removal rate of asbestos analysis interfering substances from slate samples and texture samples in C treatment group with acid treatment with aqua regia using graphite block acid circulation were 30.50% and 30.58%, respectively. So in both slates and texture samples, the removal rate of asbestos analysis interfering substances from the slates and texture samples of A, B, and D treatment groups was significantly higher(p<0.001). The newly proposed acid treatment with aqua regia using graphite block acid circulation method in this study significantly eliminated more acid solubility material and asbestos analysis interfering substances than electric high temperature furnace ashing methods according to the existing waste process and acid treatment with HCl(1+3), and this method does not go through the process with high temperature furnace ashing, it is believed that asbestos analysis can be made easier by preventing changes in the characteristics of asbestos and the use of graphite block acid collection devices when acid treatment of solid samples in buildings containing large amounts of asbestos analysis interfering substances can be more effective than conventional methods.

오옥신의 종류 및 농도가 가이즈까 향나무의 삽목 발근에 미치는 영향

윤재길,송시호,박상현 진주산업대학교 농업기술연구소 2001 農業技術硏究所報 Vol.14 No.-

Effects of auxin and Rootone on the rooting of Juniperus chinensis var. Kaizuka cutting were investigated to improve propagation efficiency. When Rootone treated, rooting was 100% compared with the control, 33%. IBA 200ppm 1h and NAA 100ppm 12h improved evidently rooting, 93% and 90%, respectively. Root fresh weight increased up to 131mg by Rootone. NAA 200ppm 12h, NAA 500ppm 1h, and IBA 200ppm 1h were also very effective to root fresh weight more than 110mg. Shoot growth(height, fresh weight and dry weight) did not increase largely, but increased a little. Dipping into high concentration auxin solution for 1min increased rooting rate and root fresh weight, but was less effective than low concentration treatment. Shoot growth did not increase largely, but increased a little. These results indicate that Rootone and IBA 200ppm 1h are most effective for improvement of rooting in Juniperus chinensis var. Kaizuka cutting.

디지털콘텐츠를 위한 백업 시스템의 설계 및 구현

윤종현,이석재,유재수 충북대학교 컴퓨터정보통신 연구소 2005 컴퓨터정보통신연구 Vol.13 No.2

첨단 IT기술의 발전으로 유무선 통신망을 통하여 다양한 환경에서 사용되는 대용량 디지털콘텐츠들이 급증하고 있다. 또한 기하급수적으로 늘어나고 있는 디지털콘텐츠를 한정된 저장 공간에 효율적으로 저장하기 위한 콘텐츠기반 저장기술에 대한 연구가 활발히 진행되고 있다. 이와 함께 불시의 사고에 의한 디지털콘텐츠의 손실을 방지하기 위해서 지속적인 데이터 백업의 중요성 또한 증가하고 있다. 본 논문에서는 디지털콘텐츠의 특성을 고려하여 데이터 입출력 I/O 크기 단위로 콘텐츠를 객체화하고 유일한 ID를 부여하여 백업 장치에 저장하는 시스템을 설계하고 구현한다. 제안하는 백업 시스템은 중복되어 발생하는 데이터는 하나의 사본만 백업하고, 이를 공유함으로써 백업되는 데이터의 양을 효과적으로 감소시킨다. With the development of IT technology, the amount of digital contents used in various environments of wired and wireless networks have been increased hugely and rapidly. Also, many researches have been done to process a contents-based storage technology that saves the digital contents in limited storage. To protect the loss of the digital contents by the sudden accident, continuous data backup is required. In this paper, we design and implement the backup system that stores digital contents in backup storage by objectifying the contents with a unit of I/O size and giving them the unique ID using the properties of digital contents. The backup system reduces the amount of backup data by backuping and sharing the only one copy of the backup data.

지구과학 학습용 Computer program 연구 : 고등학교 지구과학Ⅰ 제1단원을 중심으로 Centering around the First Unit of Highschool Earth Science Textbook Ⅰ

尹世重,金在炫,崔錫源 공주대학교 사범대학 과학교육연구소 1984 과학교육연구 Vol.16 No.1

A Computer program which could be used for teaching material in new curriculum of highschool earth science course was programed with Goldstar Co. model FC-100 personal computer in BASIC language. The main contents of this program are calculation of radius, mass, average density, the acceleration of gravity of earth and evidences for rotation of earth etc. All these substances are explained with Korean or English and by means of derivation of formula, calculation or dynamic graphs.

간헐폭기 변법에 의한 질소제거

유재현,박승조,윤철중 東亞大學校 1999 東亞論叢 Vol.36 No.-

This study is the removal of nitrogen in the tannery wastewater by modified intermittent aeration process. The experiment was performed with the tannery wastewater of J industry complex located in Pusan. The reactor volume used for experiment was 114.24l as pilot scale. The performance of this process was evaluated by variation of wastewater temperature with 30, 20, 15℃. On operating with wastewater at 30℃ the removal rate of total nitrogen and NH₃-nitrogen were about 93% and 98% respectively. NO₂-nitrogen and NO₃-nitrogen were contained with 20~30mg/L in intermittent and nitrification reactor but those were reduced with 10mg/L in effluent by denitrification bacteria. By the way on operating with wastewater at 20℃ and 15℃ the removal rate of total nitrogen was 97%, 95% respectively. Because of change of operating condition it was prevented the reduction of activity of microorganism temperature down.

호산구성 기관지염의 임상적 특징

김용현,윤여일,임건일,박상준,주재학,김용훈,박춘식 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.2

Background: Eosinophilic inflammation of airway is usually associated with airway hyperresponsiveness in bronchial asthma. However, there is a small group of patients who has the eosinophilic inflammation in the bronchial tree with normal spirometry and no evidence of airway hyperresponsiveness, which was named eosinophilic bronchitis. The objectives of this study are 1) to investigate the incidence of eosinophilic bronchitis in the chronic cough syndrome and 2) to evaluate the clinical features and course of eosinophilic bronchitis. Methods : We evaluated 92 patients who had persistent cough for 3 weeks or longer. In addition to usual diagnostic protocol, we performed differential cell count of sputum. Eosinophilic bronchitis was diagnosed when the patient had normal spirometic values, normal peak expiratory flow variability, no airway hyperresponsiveness, and sputum eosinophilia(>3%). Result : The causes of choronic cough were post-nasal drip in 33%, cough variant asthma in 16%, bronchitis in 15%, and eosinophilic bronchitis in 12% of the study subjects. Initial eosinophil percentage in sputum of patience with eosinophilic bronchitis was 26.8±6.1% (3.8-63.7%). Treatment with inhaled steroid is related with a subjective improvement of cough severity and a significant decrease of sputum eosinophil percentage (from 29.1±8.3% to 7.4±3.3%)/ During the follow up period of over ? months, recurrence of cough of was associated with reappearance of sputum eosinophilia. Conclusion : Eosinophilic bronchitis is one of the important causes of chronic cough. Assessment of airway inflammation by sputum examination is important in investigating the cause of chronic cough. Cough in eosinophilic bronchitis are effectively controlled by inhaled corticosteroid, but it recurs frequently over a long term period of follow-up(Korean J Med 60:77-84, 2001)